1 files changed, 181 insertions, 0 deletions

diff --git a/include/asm-cris/arch-v10/irq.h b/include/asm-cris/arch-v10/irq.h
new file mode 100644
index 000000000000..a2a6e1533ea0
--- /dev/null
+++ b/include/asm-cris/arch-v10/irq.h
@@ -0,0 +1,181 @@
+/*
+ * Interrupt handling assembler and defines for Linux/CRISv10
+ */
+
+#ifndef _ASM_ARCH_IRQ_H
+#define _ASM_ARCH_IRQ_H
+
+#include <asm/arch/sv_addr_ag.h>
+
+#define NR_IRQS 32
+
+/* The first vector number used for IRQs in v10 is really 0x20 */
+/* but all the code and constants are offseted to make 0 the first */
+#define FIRST_IRQ 0
+
+#define SOME_IRQ_NBR        IO_BITNR(R_VECT_MASK_RD, some)   /* 0 ? */
+#define NMI_IRQ_NBR         IO_BITNR(R_VECT_MASK_RD, nmi)    /* 1 */
+#define TIMER0_IRQ_NBR      IO_BITNR(R_VECT_MASK_RD, timer0) /* 2 */
+#define TIMER1_IRQ_NBR      IO_BITNR(R_VECT_MASK_RD, timer1) /* 3 */
+/* mio, ata, par0, scsi0 on 4 */
+/* par1, scsi1 on 5 */
+#define NETWORK_STATUS_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, network) /* 6 */
+
+#define SERIAL_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, serial) /* 8 */
+#define PA_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, pa) /* 11 */
+/* extdma0 and extdma1 is at irq 12 and 13 and/or same as dma5 and dma6 ? */
+#define EXTDMA0_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, ext_dma0)
+#define EXTDMA1_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, ext_dma1)
+
+/* dma0-9 is irq 16..25 */
+/* 16,17: network */
+#define DMA0_TX_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, dma0)
+#define DMA1_RX_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, dma1)
+#define NETWORK_DMA_TX_IRQ_NBR DMA0_TX_IRQ_NBR
+#define NETWORK_DMA_RX_IRQ_NBR DMA1_RX_IRQ_NBR
+
+/* 18,19: dma2 and dma3 shared by par0, scsi0, ser2 and ata */
+#define DMA2_TX_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, dma2)
+#define DMA3_RX_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, dma3)
+#define SER2_DMA_TX_IRQ_NBR DMA2_TX_IRQ_NBR
+#define SER2_DMA_RX_IRQ_NBR DMA3_RX_IRQ_NBR
+
+/* 20,21: dma4 and dma5 shared by par1, scsi1, ser3 and extdma0 */
+#define DMA4_TX_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, dma4)
+#define DMA5_RX_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, dma5)
+#define SER3_DMA_TX_IRQ_NBR DMA4_TX_IRQ_NBR
+#define SER3_DMA_RX_IRQ_NBR DMA5_RX_IRQ_NBR
+
+/* 22,23: dma6 and dma7 shared by ser0, extdma1 and mem2mem */
+#define DMA6_TX_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, dma6)
+#define DMA7_RX_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, dma7)
+#define SER0_DMA_TX_IRQ_NBR DMA6_TX_IRQ_NBR
+#define SER0_DMA_RX_IRQ_NBR DMA7_RX_IRQ_NBR
+#define MEM2MEM_DMA_TX_IRQ_NBR DMA6_TX_IRQ_NBR
+#define MEM2MEM_DMA_RX_IRQ_NBR DMA7_RX_IRQ_NBR
+
+/* 24,25: dma8 and dma9 shared by ser1 and usb */
+#define DMA8_TX_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, dma8)
+#define DMA9_RX_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, dma9)
+#define SER1_DMA_TX_IRQ_NBR DMA8_TX_IRQ_NBR
+#define SER1_DMA_RX_IRQ_NBR DMA9_RX_IRQ_NBR
+#define USB_DMA_TX_IRQ_NBR DMA8_TX_IRQ_NBR
+#define USB_DMA_RX_IRQ_NBR DMA9_RX_IRQ_NBR
+
+/* usb: controller at irq 31 + uses DMA8 and DMA9 */
+#define USB_HC_IRQ_NBR IO_BITNR(R_VECT_MASK_RD, usb)
+
+/* our fine, global, etrax irq vector! the pointer lives in the head.S file. */
+
+typedef void (*irqvectptr)(void);
+
+struct etrax_interrupt_vector {
+        irqvectptr v[256];
+};
+
+extern struct etrax_interrupt_vector *etrax_irv;
+void set_int_vector(int n, irqvectptr addr, irqvectptr saddr);
+void set_break_vector(int n, irqvectptr addr);
+
+#define mask_irq(irq_nr) (*R_VECT_MASK_CLR = 1 << (irq_nr));
+#define unmask_irq(irq_nr) (*R_VECT_MASK_SET = 1 << (irq_nr));
+
+#define __STR(x) #x
+#define STR(x) __STR(x)
+ 
+/* SAVE_ALL saves registers so they match pt_regs */
+
+#define SAVE_ALL \
+  "move $irp,[$sp=$sp-16]\n\t" /* push instruction pointer and fake SBFS struct */ \
+  "push $srp\n\t"       /* push subroutine return pointer */ \
+  "push $dccr\n\t"      /* push condition codes */ \
+  "push $mof\n\t"       /* push multiply overflow reg */ \
+  "di\n\t"             /* need to disable irq's at this point */\
+  "subq 14*4,$sp\n\t"   /* make room for r0-r13 */ \
+  "movem $r13,[$sp]\n\t" /* push the r0-r13 registers */ \
+  "push $r10\n\t"       /* push orig_r10 */ \
+  "clear.d [$sp=$sp-4]\n\t"  /* frametype - this is a normal stackframe */
+
+  /* BLOCK_IRQ and UNBLOCK_IRQ do the same as mask_irq and unmask_irq */
+
+#define BLOCK_IRQ(mask,nr) \
+  "move.d " #mask ",$r0\n\t" \
+  "move.d $r0,[0xb00000d8]\n\t" 
+  
+#define UNBLOCK_IRQ(mask) \
+  "move.d " #mask ",$r0\n\t" \
+  "move.d $r0,[0xb00000dc]\n\t" 
+
+#define IRQ_NAME2(nr) nr##_interrupt(void)
+#define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr)
+#define sIRQ_NAME(nr) IRQ_NAME2(sIRQ##nr)
+#define BAD_IRQ_NAME(nr) IRQ_NAME2(bad_IRQ##nr)
+
+  /* the asm IRQ handler makes sure the causing IRQ is blocked, then it calls
+   * do_IRQ (with irq disabled still). after that it unblocks and jumps to
+   * ret_from_intr (entry.S)
+   *
+   * The reason the IRQ is blocked is to allow an sti() before the handler which
+   * will acknowledge the interrupt is run.
+   */
+
+#define BUILD_IRQ(nr,mask) \
+void IRQ_NAME(nr); \
+void sIRQ_NAME(nr); \
+void BAD_IRQ_NAME(nr); \
+__asm__ ( \
+          ".text\n\t" \
+          "IRQ" #nr "_interrupt:\n\t" \
+          SAVE_ALL \
+          "sIRQ" #nr "_interrupt:\n\t" /* shortcut for the multiple irq handler */ \
+          BLOCK_IRQ(mask,nr) /* this must be done to prevent irq loops when we ei later */ \
+          "moveq "#nr",$r10\n\t" \
+          "move.d $sp,$r11\n\t" \
+          "jsr do_IRQ\n\t" /* irq.c, r10 and r11 are arguments */ \
+          UNBLOCK_IRQ(mask) \
+          "moveq 0,$r9\n\t" /* make ret_from_intr realise we came from an irq */ \
+          "jump ret_from_intr\n\t" \
+          "bad_IRQ" #nr "_interrupt:\n\t" \
+          "push $r0\n\t" \
+          BLOCK_IRQ(mask,nr) \
+          "pop $r0\n\t" \
+          "reti\n\t" \
+          "nop\n");
+
+/* This is subtle. The timer interrupt is crucial and it should not be disabled for 
+ * too long. However, if it had been a normal interrupt as per BUILD_IRQ, it would
+ * have been BLOCK'ed, and then softirq's are run before we return here to UNBLOCK.
+ * If the softirq's take too much time to run, the timer irq won't run and the 
+ * watchdog will kill us.
+ *
+ * Furthermore, if a lot of other irq's occur before we return here, the multiple_irq
+ * handler is run and it prioritizes the timer interrupt. However if we had BLOCK'ed
+ * it here, we would not get the multiple_irq at all.
+ *
+ * The non-blocking here is based on the knowledge that the timer interrupt is 
+ * registred as a fast interrupt (SA_INTERRUPT) so that we _know_ there will not
+ * be an sti() before the timer irq handler is run to acknowledge the interrupt.
+ */
+
+#define BUILD_TIMER_IRQ(nr,mask) \
+void IRQ_NAME(nr); \
+void sIRQ_NAME(nr); \
+void BAD_IRQ_NAME(nr); \
+__asm__ ( \
+          ".text\n\t" \
+          "IRQ" #nr "_interrupt:\n\t" \
+          SAVE_ALL \
+          "sIRQ" #nr "_interrupt:\n\t" /* shortcut for the multiple irq handler */ \
+          "moveq "#nr",$r10\n\t" \
+          "move.d $sp,$r11\n\t" \
+          "jsr do_IRQ\n\t" /* irq.c, r10 and r11 are arguments */ \
+          "moveq 0,$r9\n\t" /* make ret_from_intr realise we came from an irq */ \
+          "jump ret_from_intr\n\t" \
+          "bad_IRQ" #nr "_interrupt:\n\t" \
+          "push $r0\n\t" \
+          BLOCK_IRQ(mask,nr) \
+          "pop $r0\n\t" \
+          "reti\n\t" \
+          "nop\n");
+
+#endif